KROSS: Mapping the Ha emission across the star-formation sequence at z~1
We present first results from the KMOS Redshift One Spectroscopic Survey (KROSS), an ongoing large kinematical survey of a thousand, z~1 star forming galaxies, with VLT KMOS. Out of the targeted galaxies (~500 so far), we detect and spatially resolve Ha emission in ~90% and 77% of the sample respect...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal article |
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Oxford University Press
2016
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| _version_ | 1826260597911584768 |
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| author | Magdis, G Bureau, M Stott, J Tiley, A Swinbank, A Bower, R Bunker, A Jarvis, M Johnson, H Sharples, R |
| author_facet | Magdis, G Bureau, M Stott, J Tiley, A Swinbank, A Bower, R Bunker, A Jarvis, M Johnson, H Sharples, R |
| author_sort | Magdis, G |
| collection | OXFORD |
| description | We present first results from the KMOS Redshift One Spectroscopic Survey (KROSS), an ongoing large kinematical survey of a thousand, z~1 star forming galaxies, with VLT KMOS. Out of the targeted galaxies (~500 so far), we detect and spatially resolve Ha emission in ~90% and 77% of the sample respectively. Based on the integrated Ha flux measurements and the spatially resolved maps we derive a median star formation rate (SFR) of ~7.0 Msun/yr and a median physical size of <r$_{\rm e}$=""> = 5.1kpc. We combine the inferred SFRs and effective radii measurements to derive the star formation surface densities ({\Sigma}SFR) and present a "resolved" version of the star formation main sequence (MS) that appears to hold at sub-galactic scales, with similar slope and scatter as the one inferred from galaxy integrated properties. Our data also yield a trend between {\Sigma}SFR and {\Delta}(sSFR) (distance from the MS) suggesting that galaxies with higher sSFR are characterised by denser star formation activity. Similarly, we find evidence for an anti-correlation between the gas phase metallicity (Z) and the {\Delta}(sSFR), suggesting a 0.2dex variation in the metal content of galaxies within the MS and significantly lower metallicities for galaxies above it. The origin of the observed trends between {\Sigma}SFR - {\Sigma}(sSFR) and Z - {\Delta}(sSFR) could be driven by an interplay between variations of the gas fraction or the star formation efficiency of the galaxies along and off the MS. To address this, follow-up observations of the our sample that will allow gas mass estimates are necessary.</r$_{\rm> |
| first_indexed | 2024-03-06T19:08:12Z |
| format | Journal article |
| id | oxford-uuid:15dea246-7880-43ac-b5e3-d318dc5f5bd7 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:08:12Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | oxford-uuid:15dea246-7880-43ac-b5e3-d318dc5f5bd72022-03-26T10:28:00ZKROSS: Mapping the Ha emission across the star-formation sequence at z~1Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:15dea246-7880-43ac-b5e3-d318dc5f5bd7Symplectic Elements at OxfordOxford University Press2016Magdis, GBureau, MStott, JTiley, ASwinbank, ABower, RBunker, AJarvis, MJohnson, HSharples, RWe present first results from the KMOS Redshift One Spectroscopic Survey (KROSS), an ongoing large kinematical survey of a thousand, z~1 star forming galaxies, with VLT KMOS. Out of the targeted galaxies (~500 so far), we detect and spatially resolve Ha emission in ~90% and 77% of the sample respectively. Based on the integrated Ha flux measurements and the spatially resolved maps we derive a median star formation rate (SFR) of ~7.0 Msun/yr and a median physical size of <r$_{\rm e}$=""> = 5.1kpc. We combine the inferred SFRs and effective radii measurements to derive the star formation surface densities ({\Sigma}SFR) and present a "resolved" version of the star formation main sequence (MS) that appears to hold at sub-galactic scales, with similar slope and scatter as the one inferred from galaxy integrated properties. Our data also yield a trend between {\Sigma}SFR and {\Delta}(sSFR) (distance from the MS) suggesting that galaxies with higher sSFR are characterised by denser star formation activity. Similarly, we find evidence for an anti-correlation between the gas phase metallicity (Z) and the {\Delta}(sSFR), suggesting a 0.2dex variation in the metal content of galaxies within the MS and significantly lower metallicities for galaxies above it. The origin of the observed trends between {\Sigma}SFR - {\Sigma}(sSFR) and Z - {\Delta}(sSFR) could be driven by an interplay between variations of the gas fraction or the star formation efficiency of the galaxies along and off the MS. To address this, follow-up observations of the our sample that will allow gas mass estimates are necessary.</r$_{\rm> |
| spellingShingle | Magdis, G Bureau, M Stott, J Tiley, A Swinbank, A Bower, R Bunker, A Jarvis, M Johnson, H Sharples, R KROSS: Mapping the Ha emission across the star-formation sequence at z~1 |
| title | KROSS: Mapping the Ha emission across the star-formation sequence at z~1 |
| title_full | KROSS: Mapping the Ha emission across the star-formation sequence at z~1 |
| title_fullStr | KROSS: Mapping the Ha emission across the star-formation sequence at z~1 |
| title_full_unstemmed | KROSS: Mapping the Ha emission across the star-formation sequence at z~1 |
| title_short | KROSS: Mapping the Ha emission across the star-formation sequence at z~1 |
| title_sort | kross mapping the ha emission across the star formation sequence at z 1 |
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